[go: up one dir, main page]

WO1995004623A1 - Support ameliore a reglage automatique du serrage des pieces, utilisable sur les tours et les machines-outils semblables - Google Patents

Support ameliore a reglage automatique du serrage des pieces, utilisable sur les tours et les machines-outils semblables Download PDF

Info

Publication number
WO1995004623A1
WO1995004623A1 PCT/IT1994/000134 IT9400134W WO9504623A1 WO 1995004623 A1 WO1995004623 A1 WO 1995004623A1 IT 9400134 W IT9400134 W IT 9400134W WO 9504623 A1 WO9504623 A1 WO 9504623A1
Authority
WO
WIPO (PCT)
Prior art keywords
head
claws
piece
face
carrier according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IT1994/000134
Other languages
English (en)
Inventor
Gabriele Vetrala
Marco Manetti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO1995004623A1 publication Critical patent/WO1995004623A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B33/00—Drivers; Driving centres, Nose clutches, e.g. lathe dogs
    • B23B33/005—Drivers with driving pins or the like

Definitions

  • the present invention generally relates to the field of machine tools and more precisely it relates to an improved autoforcing face carrier, that can be engaged on a parallel lathe or similar machine-tool to sustain the piece and set it in rotation for the machining.
  • the pieces being machined on the lathe are subject to radial loads, i.e. orthogonal to the rotational axis, axial loads and tangential loads, due to the action of the tool which provokes the cutting away of the shavings.
  • the intensity of the radial and tangential loads is proportional to the cutting depth, the hardness of the material rotated, the cutting speed and the other machining parameters.
  • To make the piece withstand the radial and tangential loads it is axially forced by a tailstock on a motorised spindle which supports it by means of a self- centering chuck or a face carrier.
  • the self-centering chuck holds the piece by means of jaws which grip it radially, whereas the face carrier holds the piece by means of acuminate claws which wedge themselves in the face of the piece that is turned towards the carrier itself.
  • the piece To allow the piece to withstand strong radial and tangential loads, it is thus necessary that a strong axial load be exercised on it by the tailstock, a load which transmits itself entirely on the spindle. Also the face carrier or the self-centering chuck are strongly pressed and are sized appropriately to resist the great stress transmitted by the piece.
  • a type of face carrier is known which is capable of overcoming, in part, the above-mentioned inconveniences, described in the Italian utility model no. 0218067, in the name of one of the present applicants.
  • This type of face carrier comprises a head equipped with claws slidingly mounted on a body for attachment to the spindle.
  • the claws are fixed to a claw head separable from the head, and coaxial to the claw head, an elastically retractable center is present, suited to be engaged on the piece in correspondence with its rotational axis.
  • the head is in contact with the body through a plurality of spheres housed in spherical seats formed in it.
  • the spheres rollingly engage in radial grooves having a triangular cross-section. Therefore, the greater the twisting effect on the piece due to the cutting away of the shavings, the greater the axial force with which the carrier pushes its claws against the piece.
  • This type of carrier is limited by its scarce capacity for adaptation of the claws to the face of the piece when the latter is rough or is not orthogonal to the rotational axis.
  • the claw head that holds the claws although it can be oriented, has a very limited angular range and is subject to becoming caught between the center and the head. Further limitations consist in a less than optimum capacity for gripping the piece in the presence of heavy radial loads and in a scarce flexibility of the claw head to adopt to different diameters of the pieces being machined.
  • the object of the present invention is to provide an improved face carrier able to overcome the above-mentioned inconveniences, and in particular suited to grip the face of the piece even when it is not flat and orthogonal to the rotational axis.
  • a further object of the present invention is to provide an improved face carrier that is autoforcing on the piece in varying degrees according to the loads to which the piece is subjected, with a high reliability, safety and precision even in the presence of strong axial and radial pressures.
  • Yet another object of the present invention is to provide an improved face carrier that allows pieces of different diameters comprised within a certain range of variability to be set in rotation with the possibility of easily changing the gripping claws when necessary.
  • the improved face carrier characterized in that said head comprises an autoforcing element which pulls the claws against the pieces with a force which varies with the machining loads.
  • Engaged on the autoforcing element in such a way that it can be oriented, is a ring on which the shanks of the claws for gripping the piece slidingly engage.
  • These shanks slidingly engage in said head to which they are preferably secured by means of stop dowels.
  • the head engages slidingly both on an annular enlargement and on a neck of the body of the carrier.
  • FIG. 3 and 4 are partial sectional views of the head of the carrier in figure 1 in two different operative positions;
  • a substantially cylindrical body is indicated with 1, having an axial cavity 21 and an annular enlargement 22 from which a neck 23 extends.
  • Body 1 is tapered towards end la, opposite neck 23, and on which a setting cap 14 of a spring 13 housed in cavity 21 engages.
  • a cylindrical center 6 with a conical end 6a is slidingly housed, and though its sliding is allowed, its slipping is prevented by a dowel 12 which fits inside neck 23 protruding into cavity 6b of center 6. From the opposite side of end 6a, center 6 abuts spring 13.
  • a head 2 slidingly engages, having an axial cavity 24 for neck 23 in which it engages forcing against an O-ring 8 housed in reliefs 26 and 27 formed respectively in head 2 and neck 23.
  • Relief 26 is axially elongated to allow a certain axial movement of head 2 with respect to body 1. This axial movement is regulated by a plurality of spheres 7 housed in recesses 28 formed in annular enlargement 22. Spheres 7 engage against the inclined faces of an equal number of radial grooves 29 having a triangular profile and being formed on a autoforcing disc 3 made integral with head 2 by means of a screw 11.
  • disc 3 has a spherical seat 30 in which spherical surface 4a of a ring 4 engages.
  • the flat face 4b of the ring serves as a rest for shanks 35 of claws 5 having extremities in the form of knives 36 having straight blades.
  • Shanks 35 slidingly engage in seats 31 formed in head 2 and their slipping is prevented by dowels 9 which protrude into recesses 37 formed in shanks 35 themselves.
  • the face carrier according to the present invention very reliable, given that the capacity of the claws to adapt to surface 40 increases considerably the value of the torque T that they can support, and, therefore, raises greatly the values of the radial and tangential loads that can be placed on the piece during machining.
  • the carrier thus improved, allows for the adaptability of the claws while maintaining the characteristic of autoforcing, which, as stated above, allows for the limitation of the duration of axial loads of greater intensity to the duration of the heaviest machining, above-all, making it possible to release the forces on the spindle during the lighter machining.
  • a further advantage of the carrier according to the present invention consists in the facility of disassembly of head 2 and in the consequent possibility of rapidly substituting claws 5 and center 6. More precisely, when not in contact with the piece to be machined, head 2 can be slipped from body 1 easily overcoming the resistance offered by 0-ring 8. Claws 5 and center 6 can therefore be extracted loosening respectively the dowels 9 and 12 thus freeing grooves 37 and 6b respectively. It is worth noting how claw 5 of figures 1 and 2 has double grooves 37 formed on two opposite faces. In this way, knife 36 can be rotated to the two positions of figure 2, adapting to larger or smaller diameters of face 40 of the piece.
  • head 2 has face grooves 38 radially crossing one another and in the same number as claws 5. In this way, knives 36 partially sink into grooves 38 preventing shanks 35 from rotating inside holes 31 of head 2, thus preventing them from forcing against screws 9.
  • Claw 5 of figure 5 is, in particular, appropriate for pieces of small diameter, and to allow knife 36 to place itself as close as possible to the rotational axis R of the piece, center 6 of figure 6 has a portion 6c of decreased diameter.
  • Each set of claws 5 however, adopts to a certain range of diameters of workpieces 40.
  • three sets of claws respectively for diameters ranges from 16 to 140, from 60 to 210, from 100 to 380 mm are provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)

Abstract

Support amélioré pour pièces, adapté pour être monté au niveau de la broche d'une machine-outil afin de porter la pièce à usiner et simultanément de la faire tourner. Le support comporte une tête (2) équipée de mâchoires (5) montées coulissantes sur un corps (1) fixé à une broche, ladite tête (2) possédant une pointe à centrer (6) escamotable de manière élastique et pouvant venir au contact de la pièce à usiner (40) en s'alignant sur son axe de rotation. Plus précisément, la tête (2) se trouve au contact d'une pluralité de sphères (7) reçues dans des sièges (28) ménagés dans le corps (1). Les sphères (7) s'appuient contre un disque (3) de réglage automatique du serrage de la pièce, ce disque étant lui-même au contact d'une bague (4), de telle sorte qu'elle puisse être orientée au contact des queues (35) des mâchoires (5) dans le but de serrer la pièce (40), lesdites queues (35) étant engagées par coulissement dans ladite tête (20) qui est elle-même engagée par coulissement dans ledit corps (1). Le support est adapté à la fois pour que le serrage de la pièce soit réglé automatiquement en fonction des charges qu'elle subit, et pour qu'il assure le serrage de la face de la pièce même lorsque'elle n'est pas plane et orthogonale par rapport à l'axe de rotation. Par ailleurs, le support permet d'entraîner en rotation des pièces ayant des diamètres différents, et facilite le remplacement des mâchoires de serrage et la pointe à centrer.
PCT/IT1994/000134 1993-08-10 1994-08-09 Support ameliore a reglage automatique du serrage des pieces, utilisable sur les tours et les machines-outils semblables Ceased WO1995004623A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT93SP000005 IT233777Y1 (it) 1993-08-10 1993-08-10 Trascinatore frontale autoforzante
ITSP93U000005 1993-08-10

Publications (1)

Publication Number Publication Date
WO1995004623A1 true WO1995004623A1 (fr) 1995-02-16

Family

ID=11407802

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1994/000134 Ceased WO1995004623A1 (fr) 1993-08-10 1994-08-09 Support ameliore a reglage automatique du serrage des pieces, utilisable sur les tours et les machines-outils semblables

Country Status (2)

Country Link
IT (1) IT233777Y1 (fr)
WO (1) WO1995004623A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2352438C2 (ru) * 2006-10-16 2009-04-20 ГОУВПО "Брянский государственный технический университет" Поводковое устройство
EP2444183A1 (fr) * 2010-10-22 2012-04-25 Röhm GmbH Douille d'accouplement avant
WO2020082356A1 (fr) * 2018-10-26 2020-04-30 蔡赛 Structure de stocks de queue mobile d'une machine-outil à commande numérique
CN114309676A (zh) * 2021-12-30 2022-04-12 靖江泰通汽车科技有限公司 多功能万向球销的机加工组件

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH379221A (de) * 1958-12-22 1964-06-30 Myford Engineering Company Lim Plandrehspitze für Drehbänke
DE1288873B (de) * 1962-11-05 1969-02-06 Woerner Friedrich Wilhelm In die Arbeitsspindel einer Werkzeugmaschine einsetzbare Mitnehmerspitze
CH490145A (de) * 1968-02-27 1970-05-15 Rudolf Schweizer & Cie Stirnseiten-Mitnehmer
DE1602792A1 (de) * 1967-01-26 1970-08-06 Henninger Kg Teilkonstruktion einer Stirnmitnehmerzentrierspitze fuer Werkzeugmaschinen
DE1905863A1 (de) * 1962-11-05 1971-06-24 Woerner Friedrich Wilhelm In die Arbeitsspindel einer Werkzeugmaschine einsetzbare Mitnehmerspitze
DE2840184A1 (de) * 1978-09-15 1980-03-27 Hans Neidlein Stirnmitnehmer zum zentrieren und mitnehmen von werkstuecken fuer die arbeitsspindel einer drehmaschine
JPS58196907A (ja) * 1982-05-11 1983-11-16 Maruzen Seikou Kk ワ−クドライビングセンタ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH379221A (de) * 1958-12-22 1964-06-30 Myford Engineering Company Lim Plandrehspitze für Drehbänke
DE1288873B (de) * 1962-11-05 1969-02-06 Woerner Friedrich Wilhelm In die Arbeitsspindel einer Werkzeugmaschine einsetzbare Mitnehmerspitze
DE1905863A1 (de) * 1962-11-05 1971-06-24 Woerner Friedrich Wilhelm In die Arbeitsspindel einer Werkzeugmaschine einsetzbare Mitnehmerspitze
DE1602792A1 (de) * 1967-01-26 1970-08-06 Henninger Kg Teilkonstruktion einer Stirnmitnehmerzentrierspitze fuer Werkzeugmaschinen
CH490145A (de) * 1968-02-27 1970-05-15 Rudolf Schweizer & Cie Stirnseiten-Mitnehmer
DE2840184A1 (de) * 1978-09-15 1980-03-27 Hans Neidlein Stirnmitnehmer zum zentrieren und mitnehmen von werkstuecken fuer die arbeitsspindel einer drehmaschine
JPS58196907A (ja) * 1982-05-11 1983-11-16 Maruzen Seikou Kk ワ−クドライビングセンタ

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
HOLMES: "No Drive Dog Required with This Center", TOOL AND MANUFACTURING ENGINEER, vol. 49, no. 6, December 1962 (1962-12-01), MILWAUKEE US, pages 76 *
PATENT ABSTRACTS OF JAPAN vol. 8, no. 40 (M - 278)<1477> 21 February 1984 (1984-02-21) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2352438C2 (ru) * 2006-10-16 2009-04-20 ГОУВПО "Брянский государственный технический университет" Поводковое устройство
EP2444183A1 (fr) * 2010-10-22 2012-04-25 Röhm GmbH Douille d'accouplement avant
JP2012091316A (ja) * 2010-10-22 2012-05-17 Roehm Gmbh フェイスドライバー
CN102554681A (zh) * 2010-10-22 2012-07-11 罗姆股份有限公司 端面抓取件
US8621965B2 (en) 2010-10-22 2014-01-07 Roehm Gmbh Face driver
CN102554681B (zh) * 2010-10-22 2016-08-10 罗姆股份有限公司 端面抓取件
WO2020082356A1 (fr) * 2018-10-26 2020-04-30 蔡赛 Structure de stocks de queue mobile d'une machine-outil à commande numérique
CN114309676A (zh) * 2021-12-30 2022-04-12 靖江泰通汽车科技有限公司 多功能万向球销的机加工组件
CN114309676B (zh) * 2021-12-30 2022-12-09 靖江泰通汽车科技有限公司 多功能万向球销的机加工组件

Also Published As

Publication number Publication date
ITSP930005V0 (it) 1993-08-10
IT233777Y1 (it) 2000-02-10
ITSP930005U1 (it) 1993-11-10

Similar Documents

Publication Publication Date Title
US5639194A (en) Spindle extension with self-contained draw bar
US4594036A (en) Quick change tool chuck system
US4456270A (en) Chuck
AU724736B2 (en) Tool-less machine tool chuck
US4122755A (en) Self-locking chuck
US4350463A (en) Arrangement for mounting a cutter
US7044480B2 (en) Non-impact keyless chuck
US5755448A (en) Quick release chuck device
US5452906A (en) Non-impact keyless chuck
CA1082904A (fr) Mandrin a serrage automatique
US5921563A (en) Quick release integrated collet and chuck device
WO1997048513A9 (fr) Mandrin pour machine-outil sans outil
WO1996004092A1 (fr) Scie trepan a systeme d&#39;ejection de decoupe
AU721030B2 (en) Counter centrifugal chuck and mounting systems
US6517297B2 (en) Chuck and assembly with bit
US4991859A (en) Self-tightening drill chuck
WO1995004623A1 (fr) Support ameliore a reglage automatique du serrage des pieces, utilisable sur les tours et les machines-outils semblables
US3467404A (en) Centrifugal chuck
US3762732A (en) Clamping device or chuck
US5735651A (en) Spindle extension with self-contained draw bar
US2883200A (en) Collet pads
US2678218A (en) Universal expansion chuck
US2698755A (en) Gear chuck
GB2233058A (en) Lockable nuts
CN219254157U (zh) 一种车床加工用的高精后台阶筒夹

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): BR CA CN JP PL RU UA US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA